/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.iotdb.db.mpp.plan.analyze;

import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.utils.ReadWriteIOUtils;

import java.io.DataOutputStream;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

public class TypeProvider {

    private final Map<String, TSDataType> typeMap;

    public TypeProvider() {
        this.typeMap = new HashMap<>();
    }

    public TypeProvider(Map<String, TSDataType> typeMap) {
        this.typeMap = typeMap;
    }

    public TSDataType getType(String symbol) {
        return typeMap.get(symbol);
    }

    public void setType(String symbol, TSDataType dataType) {
        this.typeMap.put(symbol, dataType);
    }

    public boolean containsTypeInfoOf(String path) {
        return typeMap.containsKey(path);
    }

    public void serialize(ByteBuffer byteBuffer) {
        ReadWriteIOUtils.write(typeMap.size(), byteBuffer);
        for (Map.Entry<String, TSDataType> entry : typeMap.entrySet()) {
            ReadWriteIOUtils.write(entry.getKey(), byteBuffer);
            ReadWriteIOUtils.write(entry.getValue().ordinal(), byteBuffer);
        }
    }

    public void serialize(DataOutputStream stream) throws IOException {
        ReadWriteIOUtils.write(typeMap.size(), stream);
        for (Map.Entry<String, TSDataType> entry : typeMap.entrySet()) {
            ReadWriteIOUtils.write(entry.getKey(), stream);
            ReadWriteIOUtils.write(entry.getValue().ordinal(), stream);
        }
    }

    public static TypeProvider deserialize(ByteBuffer byteBuffer) {
        int mapSize = ReadWriteIOUtils.readInt(byteBuffer);
        Map<String, TSDataType> typeMap = new HashMap<>();
        while (mapSize > 0) {
            typeMap.put(
                    ReadWriteIOUtils.readString(byteBuffer),
                    TSDataType.values()[ReadWriteIOUtils.readInt(byteBuffer)]);
            mapSize--;
        }
        return new TypeProvider(typeMap);
    }

    @Override
    public boolean equals(Object o) {
        if (this == o) {
            return true;
        }
        if (o == null || getClass() != o.getClass()) {
            return false;
        }
        TypeProvider that = (TypeProvider) o;
        return Objects.equals(typeMap, that.typeMap);
    }

    @Override
    public int hashCode() {
        return Objects.hash(typeMap);
    }
}
